1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 23 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 24 /* All Rights Reserved */ 25 26 /* 27 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 28 * Use is subject to license terms. 29 */ 30 31 #pragma ident "%Z%%M% %I% %E% SMI" /* SVr4.0 1.4.3.1 */ 32 33 #include "mt.h" 34 #include <errno.h> 35 #include <unistd.h> 36 #include <stropts.h> 37 #include <sys/stream.h> 38 #define _SUN_TPI_VERSION 2 39 #include <sys/tihdr.h> 40 #include <sys/timod.h> 41 #include <xti.h> 42 #include <signal.h> 43 #include <syslog.h> 44 #include "tx.h" 45 46 int 47 _tx_snddis(int fd, const struct t_call *call, int api_semantics) 48 { 49 struct T_discon_req dreq; 50 struct strbuf ctlbuf; 51 struct strbuf databuf; 52 struct _ti_user *tiptr; 53 int sv_errno; 54 int retval; 55 56 if ((tiptr = _t_checkfd(fd, 0, api_semantics)) == NULL) 57 return (-1); 58 sig_mutex_lock(&tiptr->ti_lock); 59 60 if (tiptr->ti_servtype == T_CLTS) { 61 t_errno = TNOTSUPPORT; 62 sig_mutex_unlock(&tiptr->ti_lock); 63 return (-1); 64 } 65 66 if (_T_IS_XTI(api_semantics)) { 67 /* 68 * User level state verification only done for XTI 69 * because doing for TLI may break existing applications 70 * Note: This is documented in TLI man page but never 71 * done. 72 */ 73 if (!(tiptr->ti_state == T_DATAXFER || 74 tiptr->ti_state == T_OUTCON || 75 tiptr->ti_state == T_OUTREL || 76 tiptr->ti_state == T_INREL || 77 (tiptr->ti_state == T_INCON && tiptr->ti_ocnt > 0))) { 78 t_errno = TOUTSTATE; 79 sig_mutex_unlock(&tiptr->ti_lock); 80 return (-1); 81 } 82 83 /* 84 * Following check only done for XTI as it may be a risk 85 * to existing buggy TLI applications. 86 */ 87 } 88 89 if (call != NULL && call->udata.len) { 90 if ((tiptr->ti_ddatasize == T_INVALID /* -2 */) || 91 ((tiptr->ti_ddatasize != T_INFINITE /* -1*/) && 92 (call->udata.len > 93 (uint32_t)tiptr->ti_ddatasize))) { 94 /* 95 * user data not valid with disconnect or it 96 * exceeds the limits specified by the 97 * transport provider 98 */ 99 t_errno = TBADDATA; 100 sig_mutex_unlock(&tiptr->ti_lock); 101 return (-1); 102 } 103 } 104 105 /* 106 * If disconnect is done on a listener, the 'call' parameter 107 * must be non-null 108 */ 109 if ((tiptr->ti_state == T_INCON) && 110 (call == NULL)) { 111 t_errno = TBADSEQ; 112 sig_mutex_unlock(&tiptr->ti_lock); 113 return (-1); 114 } 115 116 /* 117 * look at look buffer to see if there is a discon there 118 */ 119 120 if (_t_look_locked(fd, tiptr, 0, api_semantics) == T_DISCONNECT) { 121 t_errno = TLOOK; 122 sig_mutex_unlock(&tiptr->ti_lock); 123 return (-1); 124 } 125 126 if ((tiptr->ti_lookcnt > 0) && (call == 0)) 127 _t_flush_lookevents(tiptr); /* flush but not on listener */ 128 129 do { 130 retval = _ioctl(fd, I_FLUSH, FLUSHW); 131 } while (retval < 0 && errno == EINTR); 132 if (retval < 0) { 133 sv_errno = errno; 134 t_errno = TSYSERR; 135 sig_mutex_unlock(&tiptr->ti_lock); 136 errno = sv_errno; 137 return (-1); 138 } 139 140 ctlbuf.len = (int)sizeof (struct T_discon_req); 141 ctlbuf.maxlen = (int)sizeof (struct T_discon_req); 142 ctlbuf.buf = (char *)&dreq; 143 144 dreq.PRIM_type = T_DISCON_REQ; 145 dreq.SEQ_number = (call? call->sequence: -1); 146 147 databuf.maxlen = (call? call->udata.len: 0); 148 databuf.len = (call? call->udata.len: 0); 149 databuf.buf = (call? call->udata.buf: NULL); 150 151 /* 152 * Calls to send data (write or putmsg) can potentially 153 * block, for MT case, we drop the lock and enable signals here 154 * and acquire it back 155 */ 156 sig_mutex_unlock(&tiptr->ti_lock); 157 if (putmsg(fd, &ctlbuf, (databuf.len? &databuf: NULL), 0) < 0) { 158 t_errno = TSYSERR; 159 return (-1); 160 } 161 sig_mutex_lock(&tiptr->ti_lock); 162 163 if (_t_is_ok(fd, tiptr, T_DISCON_REQ) < 0) { 164 sv_errno = errno; 165 sig_mutex_unlock(&tiptr->ti_lock); 166 errno = sv_errno; 167 return (-1); 168 } 169 170 tiptr->ti_flags &= ~(MORE|EXPEDITED); 171 172 if (tiptr->ti_ocnt <= 1) { 173 if (tiptr->ti_state == T_INCON) { 174 tiptr->ti_ocnt--; 175 tiptr->ti_flags &= ~TX_TQFULL_NOTIFIED; 176 } 177 _T_TX_NEXTSTATE(T_SNDDIS1, tiptr, 178 "t_snddis: invalid state event T_SNDDIS1"); 179 } else { 180 if (tiptr->ti_state == T_INCON) { 181 tiptr->ti_ocnt--; 182 tiptr->ti_flags &= ~TX_TQFULL_NOTIFIED; 183 } 184 _T_TX_NEXTSTATE(T_SNDDIS2, tiptr, 185 "t_snddis: invalid state event T_SNDDIS2"); 186 } 187 188 sig_mutex_unlock(&tiptr->ti_lock); 189 return (0); 190 } 191